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Configuring LAN Interfaces

Configuring a Fiber Distributed Data Interface

IC-40

Cisco IOS Interface Configuration Guide

Enabling FDDI Bridging Encapsulation

Cisco FDDI by default uses the SNAP encapsulation format defined in RFC 1042. It is not necessary to

define an encapsulation method for this interface when using the FIP.

FIP fully supports transparent and translational bridging for the following configurations:

• FDDI-to-FDDI

• FDDI-to-Ethernet

• FDDI-to-Token Ring

Enabling FDDI bridging encapsulation places the FIP into encapsulation mode when doing bridging. In

transparent mode, the FIP interoperates with earlier versions of encapsulating interfaces when

performing bridging functions on the same ring. When using the FIP, you can specify the encapsulation

method by using the following command in interface configuration mode:

When you are doing translational bridging, use routing for routable protocols and use translational

bridging for the rest (such as LAT).

Note Bridging between dissimilar media presents several problems that can prevent

communications. These problems include bit-order translation (using MAC addresses as

data), maximum transfer unit (MTU) differences, frame status differences, and multicast

address usage. Some or all of these problems might be present in a multimedia-bridged

LAN and might prevent communication. These problems are most prevalent in networks

that bridge between Token Rings and Ethernet networks or between Token Rings and FDDI

because of the different ways Token Ring is implemented by the end nodes.

We are currently aware of problems with the following protocols when bridged between Token Ring and

other media: AppleTalk, DECnet, IP, Novell IPX, Phase IV, VINES, and XNS. Further, the following

protocols might have problems when bridged between FDDI and other media: Novell IPX and XNS. We

recommend that these protocols be routed whenever possible.

Enabling Full-Duplex Mode on the FDDI

To enable full-duplex mode on the PA-F/FD-SM and PA-F/FD-MM port adapters, use one of the

following commands in interface configuration mode:

Command Purpose

fddi encapsulate

Specifies the encapsulation method for the FIP.

Command Purpose

full-duplex

no half-duplex

Enables full-duplex on the FDDI interface of the PA-F/FD-SM and

PA-F/FD-MM port adapter.

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Cisco Systems IC-23 Manual de usuario Pagina 18